Catholic Encyclopedia: Pythagoras and Pythagorean
Entry by William Turner. Concise summary of doctrines attributed to Pythagoras.
Pythagoreanism
Information about the arguments in this book written by Eric Steinhart, including overview and chapter abstracts. Interprets "pythagoreanism" in modern terms, as a philosophy radically opposed to Platonism.
Pythagoreanism
Detailed essay on the development and legacy of this school.
The Mystica: Pythagoreanism
Digest of this school's teachings and its relation to Platonism.